| 摘要 |
<p>As most broadly claimed the invention includes:- (i) a roadside installation for determining the prevailing visibility and for visibly indicating a recommended safe speed on motorway warning signs (ii) a vehicle mounted installation for determining the range of an object in front of the vehicle and for indicating to the driver the range so determined. The vehicle mounted installation may also activate vehicle controls to slow the vehicle if a condition deemed to be dangerous is detected. <IMAGE></p> |
